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相关概念视频

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.0K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

8.0K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
8.0K
Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

2.9K
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
2.9K
Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

Esters to β-Ketoesters: Claisen Condensation Mechanism

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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
3.7K
Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
4.5K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

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The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
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Synthesis of Esters Via a Greener Steglich Esterification in Acetonitrile
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碳酸盐和的反应途径

Pietro Tundo1,2, Fabio Aricò3

  • 1Ca' Foscari University of Venice, Campus Scientifico, via Torino 155, 30172, Venezia Mestre, Italy.

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|September 1, 2023
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概括

本综述探讨碳酸盐复杂的反应机制,比较它们与的反应性. 它提出了一个理论模型来理解这些相互交织的过程,突出了更绿色的合成途径.

关键词:
二氧化碳化学 化学二甲基碳酸盐二甲基碳酸盐二甲基碳酸盐埃斯特人 埃斯特人 埃斯特人绿色化学 绿色化学反应机制的反应机制

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科学领域:

  • 有机化学 有机化学
  • 物理化学 物理化学
  • 绿色化学 绿色化学

背景情况:

  • 碳酸盐和具有由各种催化机制影响的复杂反应性.
  • 了解乙和分离之间的相互作用对于预测反应结果至关重要.
  • 现有的文献提供了这些反应的实验数据,需要统一的理论框架.

研究的目的:

  • 分析和比较碳酸盐和的活性.
  • 为交织的基和酸催化机制 (BAc2/BAl2,AAc2/AAl2,AAl1) 提出一个理论模型.
  • 调查碳酸盐反应中和的作用的作用.

主要方法:

  • 从科学文献中全面审查和分析现有的实验数据.
  • 开发一个理论模型来解释竞争反应机制的能量概况.
  • 在各种催化条件下对碳酸盐和的活性进行比较分析.

主要成果:

  • 提出了一个理论模型,概述了BAc2/BAl2和AAc2/AAl1机制的能量配置差异.
  • 碳酸盐反应是由BAc2-BAl2或AAl2-AAc2机制的精确序列驱动的.
  • 热和热效应降低了吉布斯激活能量,使得在较低的温度下进行转换,只需要催化基数量.

结论:

  • 碳酸盐化学涉及密切相互连接的反应通路,对于产品形成至关重要.
  • 具体效应,如循环化和anchimeric辅助显著降低激活能量障碍.
  • 与化学相比,碳酸盐提供了更绿色的合成替代品,减少了对环境的影响.